Introduction
Occupational poisoning refers to illness, injury or death caused by exposure to toxic substances during the course of employment. Such exposure may occur through inhalation, ingestion, skin contact or accidental injection.
It may be:
- Acute: Resulting from a single or short-term high-dose exposure.
- Chronic: Developing gradually after repeated or prolonged exposure.
Hazardous workplace chemicals can affect the respiratory, nervous, reproductive, cardiovascular, urinary and immune systems and may also cause cancer.
Major Causes and High-Risk Occupations
Common occupational toxicants include:
- Pesticides and herbicides: Organophosphates, paraquat.
- Heavy metals: Lead, mercury, arsenic and cadmium.
- Industrial gases: Carbon monoxide, chlorine, ammonia and hydrogen sulphide.
- Solvents: Benzene, toluene and methanol.
- Dust and fibres: Silica, asbestos and coal dust.
- Healthcare chemicals: Disinfectants, sterilants, cytotoxic drugs and laboratory reagents.
Workers at higher risk include agricultural labourers, miners, factory workers, painters, battery manufacturers, construction workers, waste handlers and healthcare personnel.
Health Effects
Acute Effects
- Headache, dizziness and vomiting.
- Breathing difficulty.
- Skin or eye irritation.
- Convulsions and unconsciousness.
- Liver, kidney or respiratory failure.
- Death in severe cases.
Chronic Effects
- Neurological disorders.
- Lung diseases and pulmonary fibrosis.
- Kidney and liver damage.
- Reproductive and developmental disorders.
- Occupational cancers.
- Long-term disability.
For example, prolonged occupational lead exposure may cause neurological deficits and other serious chronic illnesses.
Prevention and Control
Prevention should follow the hierarchy of controls:
- Elimination: Remove the hazardous substance.
- Substitution: Replace it with a safer alternative.
- Engineering controls: Use closed systems, ventilation and isolation.
- Administrative controls: Training, exposure limits, job rotation and warning labels.
- Personal protective equipment: Gloves, masks, respirators and protective clothing.
Other measures include:
- Proper storage and labelling of chemicals.
- Safety Data Sheets at workplaces.
- Regular environmental and biological monitoring.
- Periodic health examinations of workers.
- Emergency showers, first-aid facilities and decontamination arrangements.
- Immediate referral to poison-information or medical centres.
Poison centres also support diagnosis, treatment, surveillance and prevention of poisoning.
Regulation in India
Occupational chemical safety is governed through laws and rules concerning factory safety, hazardous substances and environmental protection, including:
- Factories Act, 1948, particularly provisions relating to hazardous processes.
- Manufacture, Storage and Import of Hazardous Chemicals Rules, 1989.
- State factory rules and occupational safety requirements.
- Pesticide regulation under the Insecticides Act, 1968.
Employers handling hazardous chemicals must identify risks, prevent major accidents and provide workers with appropriate information, training and protective equipment.
Challenges and Way Forward
Major challenges include weak enforcement, inadequate worker awareness, informal employment, poor reporting of poisoning cases and limited access to occupational health services.
India should:
- Strengthen workplace inspections and exposure surveillance.
- Establish more poison-information and occupational-health centres.
- Train workers in safe handling and emergency response.
- Promote safer chemicals and mechanised processes.
- Improve reporting and compensation for occupational diseases.
- Extend occupational safety protection to informal and agricultural workers.
Conclusion
Occupational poisoning is largely preventable through safer technologies, effective regulation, worker training and continuous health surveillance. Protecting workers from hazardous chemicals is essential not only for public health but also for productivity, dignity and the constitutional goal of safe working conditions.
